+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2013.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2013 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaims all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * SCSI command processing routines, for SCSI commands issued by the host. Mass Storage
+ * devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information,
+ * which wrap around standard SCSI device commands for controlling the actual storage medium.
+ */
+
+#define INCLUDE_FROM_SCSI_C
+#include "SCSI.h"
+
+/** Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's
+ * features and capabilities.
+ */
+static const SCSI_Inquiry_Response_t InquiryData =
+ {
+ .DeviceType = DEVICE_TYPE_BLOCK,
+ .PeripheralQualifier = 0,
+
+ .Removable = true,
+
+ .Version = 0,
+
+ .ResponseDataFormat = 2,
+ .NormACA = false,
+ .TrmTsk = false,
+ .AERC = false,
+
+ .AdditionalLength = 0x1F,
+
+ .SoftReset = false,
+ .CmdQue = false,
+ .Linked = false,
+ .Sync = false,
+ .WideBus16Bit = false,
+ .WideBus32Bit = false,
+ .RelAddr = false,
+
+ .VendorID = "LUFA",
+ .ProductID = "Bootloader",
+ .RevisionID = {'0','.','0','0'},
+ };
+
+/** Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE
+ * command is issued. This gives information on exactly why the last command failed to complete.
+ */
+static SCSI_Request_Sense_Response_t SenseData =
+ {
+ .ResponseCode = 0x70,
+ .AdditionalLength = 0x0A,
+ };
+
+
+/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
+ * to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
+ * a command failure due to a ILLEGAL REQUEST.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise
+ */
+bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ bool CommandSuccess = false;
+
+ /* Run the appropriate SCSI command hander function based on the passed command */
+ switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
+ {
+ case SCSI_CMD_INQUIRY:
+ CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
+ break;
+ case SCSI_CMD_REQUEST_SENSE:
+ CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
+ break;
+ case SCSI_CMD_READ_CAPACITY_10:
+ CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
+ break;
+ case SCSI_CMD_SEND_DIAGNOSTIC:
+ CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
+ break;
+ case SCSI_CMD_WRITE_10:
+ CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+ break;
+ case SCSI_CMD_READ_10:
+ CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+ break;
+ case SCSI_CMD_MODE_SENSE_6:
+ CommandSuccess = SCSI_Command_ModeSense_6(MSInterfaceInfo);
+ break;
+ case SCSI_CMD_TEST_UNIT_READY:
+ case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
+ case SCSI_CMD_VERIFY_10:
+ /* These commands should just succeed, no handling required */
+ CommandSuccess = true;
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+ break;
+ default:
+ /* Update the SENSE key to reflect the invalid command */
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+ SCSI_ASENSE_INVALID_COMMAND,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+ break;
+ }
+
+ /* Check if command was successfully processed */
+ if (CommandSuccess)
+ {
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+ SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return true;
+ }
+
+ return false;
+}
+
+/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
+ * and capabilities to the host.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
+ uint16_t BytesTransferred = MIN(AllocationLength, sizeof(InquiryData));
+
+ /* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */
+ if ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
+ MSInterfaceInfo->State.CommandBlock.SCSICommandData[2])
+ {
+ /* Optional but unsupported bits set - update the SENSE key and fail the request */
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+ SCSI_ASENSE_INVALID_FIELD_IN_CDB,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return false;
+ }
+
+ Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL);
+
+ /* Pad out remaining bytes with 0x00 */
+ Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
+
+ /* Finalize the stream transfer to send the last packet */
+ Endpoint_ClearIN();
+
+ /* Succeed the command and update the bytes transferred counter */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+ return true;
+}
+
+/** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
+ * including the error code and additional error information so that the host can determine why a command failed to complete.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
+ uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
+
+ Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
+ Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
+ Endpoint_ClearIN();
+
+ /* Succeed the command and update the bytes transferred counter */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+ return true;
+}
+
+/** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
+ * on the selected Logical Unit (drive), as a number of OS-sized blocks.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ uint32_t LastBlockAddressInLUN = (LUN_MEDIA_BLOCKS - 1);
+ uint32_t MediaBlockSize = VIRTUAL_MEMORY_BLOCK_SIZE;
+
+ Endpoint_Write_Stream_BE(&LastBlockAddressInLUN, sizeof(LastBlockAddressInLUN), NULL);
+ Endpoint_Write_Stream_BE(&MediaBlockSize, sizeof(MediaBlockSize), NULL);
+ Endpoint_ClearIN();
+
+ /* Succeed the command and update the bytes transferred counter */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+
+ return true;
+}
+
+/** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
+ * board, and indicates if they are present and functioning correctly. Only the Self-Test portion of the diagnostic command is
+ * supported.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ /* Check to see if the SELF TEST bit is not set */
+ if (!(MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & (1 << 2)))
+ {
+ /* Only self-test supported - update SENSE key and fail the command */
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+ SCSI_ASENSE_INVALID_FIELD_IN_CDB,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return false;
+ }
+
+ /* Succeed the command and update the bytes transferred counter */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+
+ return true;
+}
+
+/** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
+ * and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual
+ * reading and writing of the data.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ * \param[in] IsDataRead Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+ const bool IsDataRead)
+{
+ uint32_t BlockAddress;
+ uint16_t TotalBlocks;
+
+ /* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
+ BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
+
+ /* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
+ TotalBlocks = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+
+ /* Check if the block address is outside the maximum allowable value for the LUN */
+ if (BlockAddress >= LUN_MEDIA_BLOCKS)
+ {
+ /* Block address is invalid, update SENSE key and return command fail */
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+ SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return false;
+ }
+
+ /* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
+ if (IsDataRead == DATA_READ)
+ VirtualFAT_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
+ else
+ VirtualFAT_WriteBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
+
+ /* Update the bytes transferred counter and succeed the command */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
+
+ return true;
+}
+
+/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about
+ * the SCSI device, as well as the device's Write Protect status.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ /* Send an empty header response with the Write Protect flag status */
+ Endpoint_Write_8(0x00);
+ Endpoint_Write_8(0x00);
+ Endpoint_Write_8(0x00);
+ Endpoint_Write_8(0x00);
+ Endpoint_ClearIN();
+
+ /* Update the bytes transferred counter and succeed the command */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
+
+ return true;
+}
+
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